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May 21st, 2009

writing a loop with letters not numbers

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How can I write a loop using letters instead of numbers so it looks like this:
2 sets used 'a-z' and 'A-Z'
aaaaa
aaaaA
aaaAa
aaAaa
and so on:
aaaAA
then on to b:
bbbbb
bbbbA

I can do it with numbers, something like this:

Python Syntax (Toggle Plain Text)
for i in range(10):
   for j in range(10):
     for k in range(10):
       print i,j,k
for i in range(10):
   for j in range(10):
     for k in range(10):
       print i,j,k

How does this work with letters?

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kiddo39

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May 21st, 2009

Re: writing a loop with letters not numbers

You can use the magic of ascii

ord("a")==97
chr(97)=="a"

slate

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May 21st, 2009

Re: writing a loop with letters not numbers

Thanks for the reply. Here's part of my problem with that:

Python Syntax (Toggle Plain Text)
for i in range(97,122):
  for j in range(97,122):
   for k in range(97,122):
     print chr(i),chr(j),chr(k)
for i in range(97,122):
  for j in range(97,122):
   for k in range(97,122):
     print chr(i),chr(j),chr(k)

That type of loop will work but will take too long to run through the combos and I would also need the Caps (65,90) to run through it.

kiddo39

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May 21st, 2009

Re: writing a loop with letters not numbers

Quote ...

I can do it with numbers, something like this:

This is not true, or you did not show us that. Your code does not produce the desired output, and it is not, that it has numbers instead of characters.

I think the problem:

Quote ...

writing a loop with letters not numbers

is solved.

Please open a new topic with something similar:
help with simple discrete math homework.

I will gladly help.

slate

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May 22nd, 2009

Re: writing a loop with letters not numbers

May be this would help you:

python Syntax (Toggle Plain Text)
 def Separate (strng):
    uppers = []
    lowers = []
    for letter in strng: 
        if letter.isupper(): 
             uppers.append(letter)
        else:
             lowers.append(letter)
 
    print "Lowers:",lowers   
    print "Uppers:",uppers
 def Separate (strng):
    uppers = []
    lowers = []
    for letter in strng: 
        if letter.isupper(): 
             uppers.append(letter)
        else:
             lowers.append(letter)
			
    print "Lowers:",lowers   
    print "Uppers:",uppers

Calling the function:

python Syntax (Toggle Plain Text)
Separate('bbbbA')
Lowers: ['b', 'b', 'b', 'b']
Uppers: ['A']
Separate('bbbbA')
Lowers: ['b', 'b', 'b', 'b']
Uppers: ['A']

1.Create two lists, one for uppers and another one for lowers

2.Use the boolean function "str.isupper()" to determine if a letter is in uppercase.

3. In case that you want to return the lowers and the uppers as string, you can use:

python Syntax (Toggle Plain Text)
uppersstr =''.join([i for i in uppers])
lowersstr = ''.join([i for i in lowers ])
uppersstr =''.join([i for i in uppers])
lowersstr = ''.join([i for i in lowers ])

Aneftaoratos

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May 22nd, 2009

Re: writing a loop with letters not numbers

Click to Expand / Collapse Quote originally posted by slate ...

This is not true, or you did not show us that. Your code does not produce the desired output, and it is not, that it has numbers instead of characters.

I think the problem:

is solved.

Please open a new topic with something similar:
help with simple discrete math homework.

I will gladly help.

I put a loop up of numbers to show that I can run a loop with a given amount of chars. I can add 2 more values to it if a list of 5 is what I'm after. Running the numbers loop will produce:
0 0 0
0 0 1
0 0 2
and so on. After the suggested use of chr() I was able to write the loop to use letters instead of numbers but my original question was how to do this with uppers as well as lowers:

Quote ...

How can I write a loop using letters instead of numbers so it looks like this:
2 sets used 'a-z' and 'A-Z':

At your suggestion, I will mark this as solved and start a new post.

kiddo39

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May 22nd, 2009

Re: writing a loop with letters not numbers

Here's some clues to help you!

python Syntax (Toggle Plain Text)
 
>>> ord('A')
65
>>> ord('a')
97
>>> ord('Z')
90
>>> ord('z')
122
>>> from string import letters
>>> letters
'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
>>> uppers = letters[26:]
>>> lowers = letters[:26]
>>> uppers
'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
>>> lowers
'abcdefghijklmnopqrstuvwxyz'
>>>
>>> ord('A')
65
>>> ord('a')
97
>>> ord('Z')
90
>>> ord('z')
122
>>> from string import letters
>>> letters
'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
>>> uppers = letters[26:]
>>> lowers = letters[:26]
>>> uppers
'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
>>> lowers
'abcdefghijklmnopqrstuvwxyz'
>>>

you cna iterate over those strings easily like this:

python Syntax (Toggle Plain Text)
for lower in lowers:
    for upper in uppers:
        print lower, upper
for lower in lowers:
    for upper in uppers:
        print lower, upper

Last edited by jlm699; May 22nd, 2009 at 10:38 am.

jlm699

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May 22nd, 2009

Re: writing a loop with letters not numbers

jlm699, thank you! That helped alot!

kiddo39

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